Newton m



(No Model.)

N. M. MANN.

DUPLEX AUTOMATIC DRAFT REGULATOR.

No. 366,493. Patented July 12, 1887.

UNITED STATES PATENT ()EEIGE.

NE\VTON M. MANN, OF ROCHESTER, NE\V YORK, ASSIGNOR TO CHARLES MANN, OF SAME PLACE.

DUPLEX AUTOMATIC DRAFT-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 366,493, dated July 12, 1887.

Application filed July 30, 1886.

To all whom it may concern.-

Be it known that I, NEWTON M. lVIANN, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented a new and useful Appliance called The Duplex Automatic DraftRegulator, of which the following is a specification.

My invention relates to improvements in the cold-air ducts of hot-air furnaces and other heaters for warming dwellings or other buildings, and to ventilating-pipes in which selfacting valves are contrived to regulate the inflow and arrest the outflowof air; and the objects of my improvements are, first, to secure the automatic closing of the ductin a measure proportional to the velocity of an inward-driving wind; second, to prevent a reverse action of the furnace or outward fiow of the heated airfrom the heater; third, by the use ofsnialler and double valves to avoid noise and secure greater ease and certainty of operation; fourth, to occupy less longitudinal space in the duct. I attain these objects by the mechanism illustrated in the accompanying drawings, in which are shown vertical sections giving a side 'view ofa portion of the cold-air box or duct containing the apparatus, exhibiting the parts in different positions assumed by them when acted upon by currents of varying force under different circumstances. The opening 11 leads to the outer air, the opening 12 toward the heater. Only the edges of the parts are seen.

Figure 1 shows the positions of the parts when the draft is undisturbed by wind from any direction; Fig. 2, the positions under the pressure of an inward-driving wind-that is, a current of air driving toward the heater in the direction indicated by the arrow'M; Fig. 3, the positions under the stress of an outward suctionthat is, a current of air flowing from the heater in the direction indicated by the arrow 15.

Similar figures refer to similar parts th roughout the several representations.

The valve 1 is hinged at 2 and the valve 3 turns upon pivots at its center. They are con neeted by the rod 4, which is attached by jointed connections to the edge of the lower valve and to a point in the upper that will Serial No. 209,570. (No model.)

bring it nearly perpendicular when the valves turn, as in Fig. 2, and are balanced by the counter-poise 5, so that when at rest they hang as in Fig. 1. The valve 1 is depressed according to the force of the inblowingwind, (shown by arrow 14,) the air pressing into the space above the valve, Fig. 1, astiff breeze bringing it to the position shown in Fig. 2. The valve 3hasamotion in the opposite direction through one quadrant. A space is left at the sides and bottom of the duct and between the valves, so that under utmost pressure they close about seven-eighths of the duct. All points of contact are covered with cloth to prevent noise.

The object of this part of the contrivance is to insure a uniform supply of air Whatever the velocity of an inblowing wind from end 11.

\Vhere a single valve is used, as in my Patent No. 173,129, granted February 8, 1876, by Letters Patent of the United States of America, it is found to move too freely afterit begins to close, the surface of the valve exposed to the force ofthe windinereasing disproportionately. This defect is overcome by the valve 3, which has no independent inclination to turn with the wind, having its bearings central. As the Valves turn to take the position shown in Fig. 2 the purchase of the eonnterpoise 5 increases, so that only a high wind will bring them to that position. Nevertheless, they are sensitive to the gentlest breeze. A single valve also .takes up more space, and, what is worse, is

The duplex aroften uuwieldly and noisy. rangement fully overcomes these objections.

To prevent a reverse action of the heater sending the hot air out of doors under the suction of a wind blowing past the outer mouth of the duct in a direction more or less opposite, and sometimes even setting fire to the eold-air box, is the object of valves Sand 7. At rest, these valves of their own weight assume the positions shown in Figs. 1 and 2. Delieately balanced upon the point 9,the valve 6 responds to the least outward suction-that is, motion of air in the direction of the arrow lS-and turns to the position shown in Fig. 3. Then the whole force of the suction is brought upon the valve 7, which is balanced by the rod and ball 10, and turns it to the position shown in Fig. 3, completely cutting off the'outward pas- ICO sage and relieving the furnace of the outward draft. As the valve 6 drops it opens a passage at 8, through which air flows freely to the furnace. (Shown by arrow 16.) This passage 8, Fig. 3, opens into the cellar, or it may be connected with a room above or with another window to avoid taking air from the cellar. The valves are made slightly narrower than the box, and cloth-covered cleats are fastened on the interior for them to drop against, also 011 the sides of the opening 8 for valve 6 to close against. A stop, 13, prevents valve 7 rising above its position in Fig. 1. By this duplex arrangement the valves are greatly reduced in size and weight, and, with less friction, there is increased certainty and promptness of action. It also helps to avoid noise.

The section of box containing the apparatus may be turned over, bringing the opening 8, Fig. 2, on the under side, or it may be placed in a vertical position equally well by changing thecounler-balances. The longitudinal space occupied does not exceed twice the depth of the box.

I claim as my invention-.

formed with lateral outlet 8, counterbalanced horizontally-pivoted valve 6, normally closing passage 8, horizontally-pivoted counterbalanced valve 7, and stop 13, the free edges of the valves being directed toward the inner end of the duct, and the valve 6 overlapping the valve 7.

3. The combination ofthe cold-air duct having lateral passage 8, the outwardly-directed valve 1, valve 3, their connection, the counterbalance, the inwardly-directed counterbalanced valves6 7, and the stop 13.

NEWTON M. MANN.

\Vitnesses:

GEo. HERBERT SMITH, Wm. B. STOREY. 

